Abstract
Interstellar grains serve as an intermediary in transferring stellar radiant energy or gas chemical energy into the heating of interstellar gas. Grain photoelectric heating, a process in which ultraviolet photons eject energetic electrons from grains into the gas, dominates the gas heating of the intercloud medium, diffuse clouds, and most photodissociation regions (PDRs); it is also significant in HII regions. Grain photoelectric heating in PDRs can explain the observed correlations of CII(158 µm) with CO J=1-0 intensities and CII(158 µm) + OI(63 µm) with infrared continuum (grain) luminosities. Gas-grain collisions and the infrared emission from grains can dominate the gas heating in molecular clouds with embedded stars. The ejection of newly-formed, vibrationally-excited H 2 molecules from grains behind dense, dissociative shocks leads to postshock gas heating which produces strong far-infrared and millimeter line emission as well as H 2 O maser emission.
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Hollenbach, D.J. (1989). The Heating of Interstellar Gas by Dust. In: Allamandola, L.J., Tielens, A.G.G.M. (eds) Interstellar Dust. International Astronomical Union / Union Astronomique Internationale, vol 135. Springer, Dordrecht. https://doi.org/10.1007/978-94-009-2462-8_21
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DOI: https://doi.org/10.1007/978-94-009-2462-8_21
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